Diamond



FIG. 1 is a top plan view of a diamond showing my new design;

FIG. 2 is a bottom plan view of the diamond of FIG. 1.

FIG. 3 is a side elevational view of the diamond of FIG. 1; and

FIG. 4 is an end elevational view of the diamond of FIG. 1.

The ornamental design for a diamond, as shown and described.